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  1. Replies
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    Few Measurements

    Took few measurements this evening:

    (1) Sample 1 vs Sample 2 - Frequency Response
    (2) Sample 1 - Distortion (2.83v at terminal - mic 20in from driver)
    (2) Sample 2 - Distortion (2.83v at...
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    Thank You! - I look forward do it.

    Thank You! - I look forward do it.
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    You are right. I'm in the process of building a...

    You are right. I'm in the process of building a bass cabinet to go along with these. I'll see how difficult it would be to get them to match (moreorless) via the crossover.
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    Need Measurements

    Hi All,

    Can someone please post raw measurements of the AMT drivers? Both Left and Right - just the AMTs.

    I just measured my pair and there is about 3-4 db in overall variance, with one...
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    I don't think I will use a protection cap. They...

    I don't think I will use a protection cap. They can be safely played down to 800hz with a second-order crossover <- that makes them pretty robust in my book. Plus given their efficiency, I plan on...
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    The Heils have arrived!

    Per UPS tracking, the Heils have arrived. I plan on taking measurements later today/tomorrow.

    Wanted to know if people are using a protection cap (e.g. 50uF or 80uF) in series for measurement...
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    Thanks, Earl! That is pretty impressive range...

    Thanks, Earl!

    That is pretty impressive range (500hz - 20Khz). May not be untrue that it can be crossed as low as 800hz. Mine will not be shipped now until tomorrow; thus, I don't expect to have...
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    Rob - I believe that design was from early 2011. ...

    Rob - I believe that design was from early 2011.

    I really doubt my driver measurements will match Dennis's.

    I must say you got your hands on a pretty decent pair. While there may be response...
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    Gate Measurement

    Jmpsmash,

    Have you tried gating your measurements? Your measurements seem to include the room response.

    You can look at the Impluse Response to see when the first reflection arises, and then...
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    I just ordered a pair

    I just ordered a pair. I will try Dennis's crossover, but before I do, I want to make sure my raw measurements are consistent with his raw measurements.

    For those at that are curious, see...
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    100% agree with this!

    100% agree with this!
  12. Anyone in the DC/MD/VA Area Own a TAD/Yuichi Based Speaker System

    As a wood working project, I would like to attempt building a pair of Yuichi horns.

    However, I don't what to pursue that endeavor without having listen to a similar system.

    I was fortunate...
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    I ended up selling the Cornwalls a few years...

    I ended up selling the Cornwalls a few years later for $1,000. At that time I had purchased them, I had no idea that the "Decorators" (were the cheapest option when they first sold), they were the...
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    Good Sound

    I was born in the mid-80s and grew up listening to mp3s players and basic Best Buy budget speakers.

    One day (in 2007), while visiting my sister, I was perusing through local classifieds...
  15. This is great idea. I will take all measurements...

    This is great idea. I will take all measurements with cap in place, and then remove it for my final measurements. I am using sweeps to take measurements - so I'll adjust the bottom end to start the...
  16. Sorry - to be clear, this won't be for...

    Sorry - to be clear, this won't be for active/bi-amp setup.

    I'm just delving into speaker design and learning how to take measurements and then using simulation software (e.g., Xsim, VituixCAD,...
  17. When measuring compression drivers with waveguides/horns.....

    Is there is a need to include a series capacitor to protect the CD? I'm not measuring at loud volumes on anything.

    If the answer to the above question is "Yes" - would it not impact the measured...
  18. Troels is a great guy. Always happy to answer any...

    Troels is a great guy. Always happy to answer any questions. His designs are highly appreciated in the diy community and he is very thorough with his documentation with the design/build process.
    ...
  19. Troels G. - "The Loudspeaker" - Inspired by JBl 43xx series.

    I thought some would enjoy this:

    http://www.troelsgravesen.dk/The-Loudspeaker.htm
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    ditto

    ditto
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    Looks like an interesting build. Are you...

    Looks like an interesting build. Are you designing your own crossovers?
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    I used to own a larger version of these horns (2"...

    I used to own a larger version of these horns (2" throat). I wish I took measurements at the time. They were used with JBL 2441 w/ Be diaphragms. I also owned a pair of Westlake-like smith horns. To...
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    Jim, Lifting the speakers off the ground made...

    Jim,

    Lifting the speakers off the ground made a huge difference. Much cleaner and less boomy bass.

    All that being said, I sold the speakers cheap on local CL. Shared my experience with the...
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    David, Do you have any suggestions oh how I...

    David,

    Do you have any suggestions oh how I can test them? The seem to sound fine. I even took near field measurements and they have a shockingly smooth response from 40hz-800hz, with THD between...
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    David, I've had a bunch of different systems...

    David,

    I've had a bunch of different systems in the same space, including my JBL 4345 studio monitors. Maybe I try taking outside measurements for them. See if removing the room helps any.
    ...
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